''Proteus hauseri'' is a

Gram-negative Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteristic is that their cell envelope consists ...

, facultatively anaerobic, rod-shaped bacterium.

Identification

Similar to other members of the

Enterobacterales Enterobacterales is an order of Gram-negative bacteria, Gram-negative, non-spore forming, Facultative anaerobic organism, facultatively anaerobic, rod-shaped bacteria with the class Gammaproteobacteria. The type genus of this order is ''Enterob ...

order, ''Proteus hauseri'' is oxidase negative, catalase positive, glucose fermenting, and nitrate reducing. ''P. hauseri'' is ONPG negative and PDA positive . Unlike the more commonly seen species of ''Proteus'', ''P. hauseri'' is also able to convert tryptophan into indole, resulting in a positive indole test. ''P. hauser''i shares a similar biochemical profile with ''

Proteus vulgaris ''Proteus vulgaris'' is a rod-shaped, nitrate-reducing, indole-positive and catalase-positive, hydrogen sulfide-producing, Gram-negative bacterium that inhabits the intestinal tracts of humans and animals. It can be found in soil, water, and ...

'' but can be differentiated by its ability to produce acid from trehalose. Most strains of ''P. hauseri'' demonstrate swarming motility, often covering the entire plate onto which it is inoculated.

History

Strains of ''Proteus vulgaris'' were historically divided into three biogroups: Biogroup 1 was characterized as negative for indole, salicin fermentation, and aesculin hydrolysis. Biogroup 2 was characterized as positive for indole, salicin, and aesculin. Biogroup 3 was characterized by positive indole production but negative for salicin and aesculin. Taxonomic studies performed on ''P. vulgaris'' biogroup 3 in 1976 suggested that this strain was atypical from the two other ''P. vulgaris'' subclusters. DNA hybridization performed on ''P. vulgaris'' biogroup 3 isolates found four distinct genomospecies, designate genomospecies 3, 4, 5, and 6. These genomospecies are difficult to differentiate phenotypically; however, ''P. vulgaris'' genomospecies 3 is unique in that it is negative for Jordan's tartrate and it was thus designated as ''Proteus hauseri''.

References

{{Taxonbar, from=Q26275317 Enterobacterales Bacteria described in 2000 Gram-negative bacteria